Dr. Alexej Bubnov
Czech Academy of Sciences, Institute of Physics, Prague, Praha, Hlavní Město, Czech Republic
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Academic Career Length
30Years (1997-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications1 December 2008 in Journal of Molecular Structure
Journal Article
Alexej BubnovVNVladimira Novotna
Vladimira NovotnaVHVera Hamplova
Vera HamplovaMKMiroslav Kašpar
Miroslav Kašpar
MGMilada Glogarová
Milada Glogarová
27 April 2016 in Journal of Materials Chemistry C
Journal Article
MCMartin Cigl
Martin CiglAlexej BubnovMKMiroslav Kašpar
Miroslav Kašpar
FHFrantišek Hampl
František Hampl
VHVera Hamplova
Vera HamplovaJSJiří Svoboda
Jiří Svoboda
+1
Novel azobenzene-based photosensitive mesogens with lactate chiral units were synthesized. In order to modify the rate of the thermal Z–E isomerization of these compounds, small lateral substituents were introduced into their core in the proximity of the azo group. The influence of lateral substitution on the kinetics of the Z–E isomerization, mesomorphic behaviour, and UV-Vis absorption spectra was studied. It was found that the position of the substituents in the azobenzene core significantly affects the rate of their thermal isomerization. The stability of Z-isomers of several studied compounds is comparable to that of compounds with complex molecular structures designed for optical data storage. Although lateral substitution influences the breadth/length ratio of the core, liquid-crystalline properties of the studied materials have been preserved.
19 January 2016 in RSC Advances
Journal Article
Alexej BubnovAIAgnieszka Iwan
Agnieszka IwanMCMartin Cigl
Martin CiglBBBartosz Boharewicz
Bartosz BoharewiczITIgor Tazbir
Igor Tazbir
VHVera Hamplova
Vera Hamplova +2
New photosensitive liquid crystalline compounds with a specific molecular structure have been designed in order to use them as functional dopants for organic photovoltaic devices.
30 March 2011 in Phase Transitions
Journal Article
RSRavi K. Shukla
Ravi K. ShuklaKRK.K. Raina
K.K. RainaVHVera Hamplova
Vera HamplovaMKM. Kašpar
M. Kašpar
Alexej BubnovFerroelectric liquid crystal–multiwall carbon nanotube (FLC-MWCNTs) composite systems have been prepared by dispersing low (0.03 and 0.10 wt.%) concentration of MWCNTs in the liquid crystal matrix. Relaxation behaviours of pure and composite systems have been investigated. Thermo-optic studies infer a small shift (∼5 K) in the clearing temperature of the dispersed systems. Dielectric measurements reveal that the MWCNTs influenced the permittivity. The relaxation time, relaxation frequency and dielectric strength have been evaluated and discussed. The influence of MWCNTs concentration on the conductivity of composite systems has been investigated.
3 October 2016 in Liquid Crystals
Journal Article
KKKatarzyna Kurp
Katarzyna Kurp
Michal CzerwińskiMTMarzena Tykarska
Marzena TykarskaAlexej BubnovNew functional multicomponent ferroelectric liquid crystalline mixtures have been designed while searching smart self-assembling materials with submicrometre periodicity of the helical structure responding definite demands for application in electro-optic devices and photonics that exploit the deformed helix ferroelectric effect. The resulting designed mixtures possess the paraelectric smectic A* and the tilted ferroelectric smectic C* phases over a very broad temperature range down below the room temperature. The mesomorphic, electro-optic and dielectric properties have been studied and discussed. The presence of a very stable enantiotropic ferroelectric smectic phase exhibiting almost temperature independent helical pitch within 150–250 nm range and reasonably high values of the tilt angle might allow these mixtures to be applicable for practical purposes. GRAPHICAL ABSTRACT
29 May 2013 in Macromolecules
Journal Article
Alexey BobrovskyVSValery Shibaev
Valery Shibaev
Alexej BubnovVHVera Hamplova
Vera HamplovaMKMiroslav Kašpar
Miroslav Kašpar
MGMilada Glogarová
Milada Glogarová
About Me
In 1999 Alexej Bubnov has received their PhD degree in Condensed Matter Physics & Materials Science from the Charles University in Prague. Since 1995 he worked as a research assistant, postdoc and researcher at the Institute of Physics of the Czech Academy of Sciences and, subsequently, since 2005 served as staff scientist and since 2020 as a senior staff scientist. In 2003 he was a research fellow at Trinity College of Dublin and in 2006 he was a Marie Curie research fellow in Warsaw University. He was an invited professor at Moscow State University within 2010-2013. Since 2002 Dr. Bubnov is appointed as an independent expert of European Commission serving with evaluation exercises as an expert/rapporteur/vice-chair on several hundred European projects and project proposals belonging to different Calls under FP6, FP7, H2020 and Horizon-Europe programs. Dr. Bubnov has contributed greatly to the understanding of molecular structure – mesomorphic property relationship of liquid crystalline materials possessing the self-assembling behaviour. Dr. Bubnov research expertise and activities are related to material science, soft matter physics and physical chemistry of organic self-assembling materials of various shape and functionality, in particular: functional liquid crystals (LC), LC monomers/polymers/elastomers and related subjects including nano-composites and nano-materials. His research interests are concentrated on: cell fabrication, alignment; differential scanning calorimet
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